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- catalog contributor b4423370.
- catalog created "1939.".
- catalog date "1939".
- catalog date "1939.".
- catalog dateCopyrighted "1939.".
- catalog description "Bibliography: p.151-160.".
- catalog description "Issued also as thesis (PH.D) Columbia University.".
- catalog extent "x,179p.".
- catalog isPartOf "Contributions to education, no.769".
- catalog issued "1939".
- catalog issued "1939.".
- catalog language "eng".
- catalog publisher "New York, Teachers College, Columbia University,".
- catalog subject "510.712".
- catalog subject "Ability.".
- catalog subject "Exceptional children.".
- catalog subject "Mathematics Study and teaching.".
- catalog subject "QA11 .M25 1939a LB5.C8 no.769".
- catalog title "The relative difficulty of certain topics in mathematics for slow-moving ninth grade pupils, by Virgil S. Mallory.".
- catalog type "text".